docs: fix typos and copy-paste errors in example comments

[Avicennasis]

Summary

Fix 17 typos and copy-pasted comments across 5 examples. Comments only - no code,
no identifiers and no user-visible strings were changed.

All four routing examples (map-with-pedestrian-route-from-a-to-b,
map-with-route-from-a-to-b, map-with-route-from-a-to-b-using-public-transport,
map-with-truck-route-from-a-to-b), in demo.js:

• A representitive styling can be found the full JS + HTML code -> A representative styling can be found in the full JS + HTML code (typo plus the missing in)
• Opens/Closes a infobubble -> Opens/Closes an infobubble

map-with-route-from-a-to-b-using-public-transport/demo.js

• Calculates and displays a public trasnsport route -> ... a public transport route

Copy-pasted JSDoc summaries. addWaypointsToPanel and addSummaryToPanel both
carry the summary line belonging to addManueversToMap
(Creates a series of H.map.Marker points from the route and adds them to the map.),
which describes neither function:

• addWaypointsToPanel (pedestrian, route, public-transport) -> Creates a list of the route waypoints and adds it to the route panel.
• addSummaryToPanel (all four) -> Creates the route summary and adds it to the route panel.

custom-cluster-theme/demo.js

• Get a reference to data object our noise points -> Get a reference to data object of our noise point (the callback receives a single noisePoint)

Note: addManueversToMap / addManueversToPanel are also misspelled
(Manuevers should be Maneuvers), but those are function names, so they were
deliberately left alone here to keep this PR comment-only. Happy to send that as a
separate rename if you would like it.